Long-Term Psychodynamic Psychotherapy in Complex Mental Disorders: Update of a Meta-Analysis Falk Leichsenring and Sven Rabung

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Long-Term Psychodynamic Psychotherapy in Complex Mental Disorders: Update of a Meta-Analysis Falk Leichsenring and Sven Rabung The British Journal of Psychiatry (2011) 199, 15–22. doi: 10.1192/bjp.bp.110.082776 Review article Long-term psychodynamic psychotherapy in complex mental disorders: update of a meta-analysis Falk Leichsenring and Sven Rabung Background Dose–effect relationship data suggest that short-term treatments terminated. Ten studies with 971 patients were psychotherapy is insufficient for many patients with included. chronic distress or personality disorders (complex mental disorders). Results Between-group effect sizes in favour of LTPP compared with Aims less intensive (lower dose) forms of psychotherapy ranged To examine the comparative efficacy of long-term between 0.44 and 0.68. psychodynamic psychotherapy (LTPP) in complex mental Conclusions disorders. Results suggest that LTPP is superior to less intensive forms of psychotherapy in complex mental disorders. Further Method research on long-term psychotherapy is needed, not only for We conducted a meta-analysis of controlled trials of LTPP psychodynamic psychotherapy, but also for other therapies. fulfilling the following inclusion criteria: therapy lasting for at least a year or 50 sessions; active comparison conditions; Declaration of interest prospective design; reliable and valid outcome measures; None. From both a clinical and a health-economic perspective it is mental disorders, and such patients report significantly greater important to distinguish between patients who will benefit deficits in social and occupational functioning.9,10 sufficiently from short-term psychotherapy and those for whom Some data suggest that long-term psychotherapy may be long-term psychotherapy is required. Data on dose–effect helpful for these groups of patients.1,3,11–14 This is true not relationships suggest that most patients experiencing acute distress only for psychodynamic therapy, but also for psychotherapeutic benefit from short-term psychotherapy.1 Short-term psycho- approaches that are usually short-term, such as cognitive– therapy may be defined as a treatment of up to 25 sessions;2 behavioural therapy (CBT).14,15 For long-term psychodynamic applying this definition to the data reported by Kopta et al, about psychotherapy (LTPP), however, strong evidence-based support 70% of the patients with acute distress recovered after short-term as yet is lacking. In a recent meta-analysis of the effectiveness of therapy.1 For patients with chronic distress, about 60% recovered LTTP we focused on complex mental disorders which were after 25 sessions. For patients with characterological distress, i.e. defined as personality disorders, chronic mental disorders or personality disorders, the data of Kopta et al suggest that about multiple mental disorders.16 Twenty-three studies fulfilled the 40% recovered after 25 sessions.1 Perry et al estimated the inclusion criteria. Both randomised controlled trials (RCTs) and length of treatment necessary for patients with personality quasi-experimental observational studies were included, allowing disorder to achieve recovery (defined as no longer meeting us to test for differences between study type. As the number of the full criteria for a personality disorder): according to these controlled studies was small, we calculated within-group effect estimates, half of such patients would recover after 1.3 years or sizes throughout. Large and stable effect sizes were reported for 92 sessions, and three-quarters after 2.2 years or about 216 LTPP in patients with these complex disorders.16 For the studies sessions.3 Summing up, the majority of patients with acute including control groups, we compared the within-group effect distress benefit significantly from short-term psychotherapy, sizes between the LTPP conditions and the control conditions: whereas for many patients with chronic distress and for the effect sizes for LTPP were significantly larger than those in the majority of patients with personality disorders, short-term control conditions.16 However, comparing within-group effect psychotherapy seems not to be sufficient. sizes between treatments uses treatment conditions rather than Evidence-based treatments for these groups of patients are studies as units of analysis, which may reduce the effect of particularly important. Personality disorders, for example, are randomisation.17 This may weaken internal validity, but it does not uncommon in both general and clinical populations. They not necessarily imply that internal validity is severely impaired.18 show a high comorbidity with a wide range of Axis I disorders In order to address this problem we decided to update this meta- and are significantly associated with functional impairments.4–6 analysis, including new studies where available. For the Furthermore, personality disorders were found to have a negative comparison of LTPP and the control conditions between-group prognostic impact on depressive disorders.7 For this reason, effect sizes were assessed, focusing on complex mental disorders experts recommend not focusing on the depressive disorder but as defined above. Our 2008 meta-analysis was criticised by some primarily treating the associated personality disorder.7,8 Another authors for addressing an ‘unconventionally broad research population for whom short-term treatment may not be sufficient question’ by including heterogeneous patient populations and are those with multiple mental disorders. A high proportion of comparison conditions.17 On the contrary, however, researchers patients in clinical populations have not just one but several often adopt unnecessarily narrow entry criteria; a broad 15 Leichsenring & Rabung perspective on meta-analysis covering different patient (c) active treatments applied in the control conditions; populations and settings increases the generalisability and 19 (d) prospective studies of LTPP including pre- and post-treatment usefulness of results. If results are not homogeneous, subgroup or follow-up assessments; analysis can be used to examine the reasons. In the 2008 meta- analysis we carried out several subgroup analyses for different (e) treatments must have been terminated (no study assessing diagnostic groups.16 In line with these considerations, our outcome for ongoing treatments); updated meta-analysis focused on complex mental disorders (f) use of reliable and valid outcome measures; (again defined as personality disorders, chronic mental disorders or multiple mental disorders), addressing the question whether (g) a clearly described sample of patients with ‘complex’ disorders LTPP is superior to shorter or less intensive psychotherapy in (personality disorders, chronic mental disorders or more than treating these disorders. one mental disorder); (h) adult patients (at least 18 years of age); Method (i) sufficient data to allow determination of between-group effect sizes. The procedures followed in our study are consistent with recent We collected studies of LTPP that were published between guidelines for the reporting of meta-analyses.20 January 1960 and April 2010 based on our previous meta-analysis and an updated computerised search of Medline, PsycINFO Definition of LTPP and Current Contents.16 The following search terms were Psychodynamic psychotherapy serves as an umbrella concept used: (psychodynamic OR dynamic OR psychoanalytic* OR encompassing treatments that operate on a continuum of transference-focused OR self psychology OR psychology of self) supportive–interpretive psychotherapeutic interventions.2,21–23 AND (therapy OR psychotherapy OR treatment) AND (study Interpretive interventions aim to enhance patients’ insight into OR studies OR trial*) AND (outcome OR result* OR effect* OR repetitive conflicts sustaining their problems;2 supportive change*) AND (psych* OR mental*) AND (rct* OR control* interventions aim to strengthen abilities that are temporarily OR compar*). In addition, articles and textbooks were manually inaccessible to patients owing to acute stress (e.g. traumatic searched, and we communicated with authors and experts in the events) or have not been sufficiently developed (e.g. impulse field. control in borderline personality disorder). The establishment of a helping (or therapeutic) alliance is regarded as an important Data extraction component of supportive interventions.22 Transference, defined We independently extracted the following information from the as the repetition of past experiences in present interpersonal articles: author names, publication year, psychiatric disorder relations, constitutes another important dimension of the treated with LTPP, age and gender of patients, duration of LTPP, therapeutic relationship. In psychodynamic psychotherapy, number of sessions, type of comparison group, sample size in each transference is regarded as a primary source of understanding group, use of treatment manuals (yes/no), general clinical and therapeutic change.2,22 The emphasis that psychodynamic experience of therapists (years), specific experience with the psychotherapy puts on the relational aspects of transference is a patient group under study (years), specific training of therapists key technical difference from cognitive–behavioural therapies.24 (yes/no), study design (RCT v. effectiveness), duration of follow- The use of more supportive or more interpretive (insight- up period and use of psychotropic medication.16 Disagreements enhancing) interventions depends on the patient’s needs. The were resolved by consensus. Rating was done without masking more severely disturbed a patient is or the more acute the to treatment
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